//invalid identifiers:
$identifiers[]="'àaàsas"; //' is not allowed at all
$identifiers[]="\"àaàsas"; //" is not allowed at all
$identifiers[]="àaà'sas"; //' is not allowed at all
$identifiers[]="àaà\"sas"; //" is not allowed at all
$identifiers[]=" àaàsas"; //whitespaces at the beginning are not allowed
$identifiers[]="àaàsas "; //whitespaces at the end are not allowed
$identifiers[]="\$àaàsas"; //$ is not allowed at all
$identifiers[]="\\àaàsas"; //\ is not allowed at all
$identifiers[]="àaà sas"; //whitespaces in between are not allowed
$identifiers[]=" à aà sa&s"; //Multiple mistakes